Diffusion

Diffusion is the natural movement of molecules from:

• Areas of low concentration to areas of high concentration

• Areas of high concentration to areas of low concentration

• Cold to hot environments

• Gaseous to liquid environments

Which of the following describes molecules moving down a concentration gradient?

• Sugar settling at the bottom of a water glass

• A cell with lots of water in it absorbing even more water

• A bottle of soda in which bubbles of carbon dioxide are evenly distributed

• Warm air moving from a radiator to fill up a room

Which of the following describes a state of equilibrium?

• A group of molecules that have stopped moving completely

• A room whose temperature is consistent throughout

• Carbon dioxide bubbles escaping from a soda bottle when it's opened

• A tree's roots absorbing nutrients from the soil

When do molecules stop moving or vibrating?

• When equilibrium is reached

• Never

• When the temperature is below 0 degrees Celsius

• When the substance they are part of becomes a solid

Tags

NGSS.MS-PS1-4

What causes diffusion?

• The constant, random motion of molecules

• Magnetic attraction between atoms

• The nuclear forces that hold atoms together

• The tendency of atoms to form chemical bonds with one another

Tags

NGSS.MS-PS3-5

From fastest to slowest rate of diffusion, which of the following is in the correct sequence?

• Solids, liquids, gases

• Liquids, gases, solids

• Gases, liquids, solids

• Gases, solids, liquids

Which of the following will diffuse the fastest?

• A tablespoon of sugar in a glass of water

• Heat through a solid piece of steel

• A pinch of salt in a glass of water

• The smell of bacon cooking throughout a room

Why is diffusion so important in biology?

• It's the basic power source for most types of cells

• It allows substances to move across cell membranes

• It prevents toxins from entering our bodies

• Without diffusion, cell division could not take place

Tags

NGSS.MS-LS1-2

What happens to the coffee particles when coffee is added to hot water?

• They sink to the bottom of the cup

• They spread out

• They clump together

• They freeze

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What does a 'region with high concentration' mean?

• An area with a SMALL number of particles

• An area with a LARGE number of particles

• An area with an UNEVEN number of particles

• An area with no particles